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//===-- DynamicLinker.cpp - Implement DynamicLinker interface -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Lightweight interface to dynamic library linking and loading, and dynamic
// symbol lookup functionality, in whatever form the operating system
// provides it.
//
// Possible future extensions include support for the HPUX shl_load()
// interface, the Mac OS X NSLinkModule() interface, and the Windows
// LoadLibrary() interface.
//
// Note that we assume that if dlopen() is available, then dlsym() is too.
//
//===----------------------------------------------------------------------===//
#include "Support/DynamicLinker.h"
#include "Config/dlfcn.h"
#include "Config/windows.h"
#include <cassert>
using namespace llvm;
bool llvm::LinkDynamicObject (const char *filename, std::string *ErrorMessage) {
#if defined (HAVE_DLOPEN)
if (dlopen (filename, RTLD_NOW | RTLD_GLOBAL) == 0) {
if (ErrorMessage) *ErrorMessage = dlerror ();
return true;
}
return false;
#elif defined(HAVE_WINDOWS_H)
if (LoadLibrary(filename))
return false;
if (ErrorMessage) {
char Buffer[100];
// FIXME: This should use FormatMessage
sprintf(Buffer, "Windows error code %d\n", GetLastError());
*ErrorMessage = Buffer;
}
return true;
#else
assert (0 && "Dynamic object linking not implemented for this platform");
#endif
}
void *llvm::GetAddressOfSymbol (const char *symbolName) {
#if defined (HAVE_DLOPEN)
# ifdef RTLD_DEFAULT
return dlsym (RTLD_DEFAULT, symbolName);
# else
static void* CurHandle = dlopen(0, RTLD_LAZY);
return dlsym(CurHandle, symbolName);
# endif
#elif defined(HAVE_WINDOWS_H)
static HMODULE ModHandle = NULL;
if (ModHandle == 0) ModHandle = GetModuleHandle(NULL);
return (void*)GetProcAddress(ModHandle, symbolName);
#else
assert (0 && "Dynamic symbol lookup not implemented for this platform");
#endif
}
// soft, cushiony C++ interface.
void *llvm::GetAddressOfSymbol(const std::string &symbolName) {
return GetAddressOfSymbol(symbolName.c_str());
}
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